Email is decentralized is it not? It's pretty frictionless to create a new email address with whichever provider. You can have as many as you want. Some are free, others you pay for. You can even run your own email server (if you want to deal with the pain that entails).
I think we're so used to email we forget how well it works.
Actually great point. It's been a bit ruined by spam detection and trust, but definitely still a good decentralized option.
> I think we're so used to email we forget how well it works.
You're right and that's quite a testament to it.